No, because since it’s only a third party app implementation, tags wouldn’t follow if I go from my phone to my desktop or any other device. It also just seems kinda… Strange?

Do you keep a journal of those you meet in-person? No judgement if you do, but if your reaction to that question was “Eww, no!” but also do user tagging I would be very curious as to what the difference is for you.

Anyways, for problematic people they either get blocked or banned (the egregious ones) which by nature of it being a first-party feature is already synced.